The Collaborative International Dictionary
Persuadable \Per*suad"a*ble\, a. That may be persuaded. -- Per*suad"a*ble*ness, n. -- Per*suad"a*bly, adv.
Douglas Harper's Etymology Dictionary
"capable of being persuaded," 1737, from persuade + -able. Fowler recommends this over the older adjective, persuasible (late 14c.), from Latin persuasibilis "convincing, persuasive," from persuad-, past participle stem of persuadere (see persuade). This originally meant "having power to persuade," but c.1500 it also acquired the meaning "capable of being persuaded" and the older sense became obsolete.
Wiktionary
a. Easily persuaded, convinced or manipulated
WordNet
adj. being susceptible to persuasion [syn: convincible, persuasible, suasible]
Usage examples of "persuadable".
She thought it could scarcely escape him to feel that a persuadable temper might sometimes be as much in favour of happiness as a very resolute character.
They had just eaten an unusually good meal: Hermione had been to a supermarket under the Invisibility Cloak (scrupulously dropping the money into an open till as she left), and Harry thought that she might be more persuadable than usual on a stomach full of spaghetti Bolognese and tinned pears.